Class 10SciencePeriodic Classification of ElementsMix Examples - Periodic Classification of Elements
EasyWrite the atomic numbers of two elements $X$ and $Y$ having electronic configurations $2, 8, 2$ and $2, 8, 6$ respectively.
(N/A) The atomic number of an element is equal to the total number of electrons present in its neutral atom.
For element $X$,the electronic configuration is $2, 8, 2$. The total number of electrons is $2 + 8 + 2 = 12$. Therefore,the atomic number of $X$ is $12$.
For element $Y$,the electronic configuration is $2, 8, 6$. The total number of electrons is $2 + 8 + 6 = 16$. Therefore,the atomic number of $Y$ is $16$.
For element $X$,the electronic configuration is $2, 8, 2$. The total number of electrons is $2 + 8 + 2 = 12$. Therefore,the atomic number of $X$ is $12$.
For element $Y$,the electronic configuration is $2, 8, 6$. The total number of electrons is $2 + 8 + 6 = 16$. Therefore,the atomic number of $Y$ is $16$.
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Similar Questions
Which of the following are the characteristics of isotopes of an element?
$(i)$ Isotopes of an element have same atomic masses
$(ii)$ Isotopes of an element have same atomic number
$(iii)$ Isotopes of an element show same physical properties
$(iv)$ Isotopes of an element show same chemical properties
$(i)$ Isotopes of an element have same atomic masses
$(ii)$ Isotopes of an element have same atomic number
$(iii)$ Isotopes of an element show same physical properties
$(iv)$ Isotopes of an element show same chemical properties
Medium
View SolutionThe elements $A$,$B$,$C$,$D$,and $E$ have atomic numbers $9$,$11$,$17$,$12$,and $13$ respectively. Which pair of elements belongs to the same group?
Medium
View Solution$(i)$ State Modern Periodic Law.
$(ii)$ How many :
$(a)$ groups and
$(b)$ periods are present in the modern periodic table?
$(iii)$ State how the problem of placing:
$(a)$ hydrogen,
$(b)$ isotopes of an element has been solved in this periodic table.
$(ii)$ How many :
$(a)$ groups and
$(b)$ periods are present in the modern periodic table?
$(iii)$ State how the problem of placing:
$(a)$ hydrogen,
$(b)$ isotopes of an element has been solved in this periodic table.
Medium
View SolutionThe elements $A, B, C, D$ and $E$ have atomic numbers $9, 11, 17, 12$ and $13$ respectively. Which pair of elements belong to the same group?
Medium
View SolutionWhat is meant by 'group' in the modern periodic table? How do the following change on moving from top to bottom in a group?
$(i)$ Number of valence electrons
$(ii)$ Number of occupied shells
$(iii)$ Size of atoms
$(iv)$ Metallic character of elements
$(v)$ Effective nuclear charge experienced by valence electrons.
$(i)$ Number of valence electrons
$(ii)$ Number of occupied shells
$(iii)$ Size of atoms
$(iv)$ Metallic character of elements
$(v)$ Effective nuclear charge experienced by valence electrons.
Medium
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